Barbara is planning a party. she invited some school friends and 2 times as many friends from her swimming club as school friends. if a total of 21 friends came to her party, how many school friends did she invite
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Home » Mathematics » Barbara is planning a party. she invited some school friends and 2 times as many friends from her swimming club as school friends. if a total of 21 friends came to her party, how many school friends did she invite